The AT9932 features a unique feed-forward current control scheme, differential output current sensing, soft start, protection from short or open LED load. Switching frequency can be programmed with a single external resistor. The AT9932 includes a temperature fold-back of the output current using an external NTC resistor. This feature allows maximizing the light output of the LED load over the entire operating temperature range.
AT9932 main features:
Constant output current
Steps output voltage up or down
Very low susceptibility to Input voltage transients
Frequency jitter
Externally programmable fixed switching frequency
Temperature foldback with external NTC resistor
Internal 40V voltage regulator
+/- 1A MOSFET gate driver
Short LED protection
Open LED protection
Input undervoltage protection
Enable & PWM dimming
Trimmed reference (± 3% accurate)
AEC-Q100 compliant
AT9932 application:
Automobile lighting
Battery powered LED lamps
Other low voltage AC / DC or DC / DC LED drivers
figure 1. AT9932 functional block diagram
figure 2. AT9932 typical application circuit diagram
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